♻️ refactor: unify and rephrase options descriptions

[welpo]

Summary

Unifies --help and default config strings.

Now there's one source of truth for these strings, which will become handy for the next PR ✌️

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How has this been tested?

• Manual tests
• Unit tests
• Integration tests

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Type of change

• Bug fix (fixes an issue without altering functionality)
• New feature (adds non-breaking functionality)
• Breaking change (alters existing functionality)
• UI/UX improvement (enhances user interface without altering functionality)
• Refactor (improves code quality without altering functionality)
• Documentation update
• Other (please describe below)

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Checklist

• I have read the contributing guidelines.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code follows the code style of this project.
• I have formatted the code with cargo fmt.
• My change requires updating the documentation.
• I have updated the documentation accordingly.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8eca1e3) 95.81% compared to head (b2ac378) 95.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   95.81%   95.83%   +0.01%     
==========================================
  Files          10       10              
  Lines         622      624       +2     
==========================================
+ Hits          596      598       +2     
  Misses         26       26              

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